水平管内非共沸混合物R50/R170两相流摩擦压降实验  

Experimental investigation on two-phase frictional pressure drop of zeotropic mixtures of R50/R170 in a horizontal tube

作　　者：庄晓如[1,2] 陈高飞 宋庆路[1,2] 汤奇雄 杨志强 邹鑫 公茂琼[1,2] 

机构地区：[1]中国科学院理化技术研究所,中国科学院低温工程学重点实验室,北京100190 [2]中国科学院大学未来技术学院,北京100049

出　　处：《科学通报》2018年第4期471-480,共10页Chinese Science Bulletin

基　　金：国家自然科学基金(51625603,51506210)资助

摘　　要：开展了非共沸混合物R50/R170在管内径为4 mm的水平管内两相流摩擦压降实验研究.实验测量的压力范围为1.5~2.5 MPa,质量流率范围为99~255 kg m^(-2)s^(-1),干度范围为0~0.9,R50/R170混合物的初始浓度组分比(摩尔分数)分别为0.27:0.73,0.54:0.46和0.7:0.3.分析了质量流率、饱和压力、干度和浓度组分对摩擦压降的影响,结果表明浓度组分对摩擦压降的影响主要是由气相密度差异造成的.将所获得的实验数据与20个经典两相流摩擦压降关联式进行对比分析,得到Friedel的关联式对本实验数据预测最好,其平均绝对相对偏差为19.26%,且有87.45%的数据点在±30%的平均相对偏差范围内.In recent years,due to the environmental issues,suitable substitutes are being searched to replace the traditional chlorinated refrigerants.With zero ozone depleting potential,low global warming potential and high thermodynamic performance,the hydrocarbons are suitable selections in refrigerators and heat pump systems.As hydrocarbons,R50 and R170 are also the important parts of the natural gas and often-used components in mixture refrigerants for the low-temperature Joule-Thomson refrigerator.As the flow characteristics play important parts in the design and optimization of the heat exchangers in refrigerators and air-conditioning systems,the two-phase frictional pressure drop should be well examined and analyzed.Although there are massive experimental studies on two-phase frictional pressure drop of hydrocarbons in horizontal tubes,the published experimental investigations for zeotropic mixtures of R50/R170 are rare.Therefore,it’s desirable to conduct an experimental investigation on two-phase frictional pressure drop of zeotropic mixtures of R50/R170 in a horizontal tube and find a suitable correlation.In this paper,two-phase frictional pressure drop of R50/R170 mixtures（0.27：0.73,0.54：0.46 and 0.7：0.3 by mole）was studied experimentally in a horizontal tube with inner diameter of 4 mm.The tests were carried out at saturation pressures from 1.5 MPa to 2.5 MPa for mass fluxes from 99 kg m^（-2） s^（-1） to 255 kg m^（-2） s^（-1）,vapor qualities from 0 to 0.9.The uncertainty for the pressure drop was 40 Pa and the uncertainties for the vapor quality with a95%confidence interval were less than 11.74%under the employed operation conditions.The effects of mass flux,saturation pressure,vapor quality and concentration on two-phase frictional pressure drop were examined and analyzed.Some conclusions can be drawn that（1）the frictional pressure drops increase with the increasing mass flux and the impact becomes more obvious when the vapor quality increases;（2）the frictional pressure drops de

关 键 词：摩擦压降 非共沸混合物 R50/R170 两相流 水平管 

分 类 号：TB64[一般工业技术—制冷工程]